Continuity mistake: When Brick is first shown in the garbage can, there is garbage up to the top of it, but when Brick manages to knock it over while still inside, there is much less garbage in the can.
Continuity mistake: When Sue is sitting at the counter waiting for the cheerleaders to call, the phones lying on the counter go from being close together to being spread out like a fan throughout the scene. Every time she is shown the phones are laid out differently.